Sourced fromjs-yaml's changelog.

[3.14.2] - 2025-11-15

Security

• Backported v4.1.1 fix to v3

[4.1.1] - 2025-11-12

Security

• Fix prototype pollution issue in yaml merge (<<) operator.

[4.1.0] - 2021-04-15

Added

• Types are now exported asyaml.types.XXX.
• Every type now hasoptions property with original arguments kept as they were(seeyaml.types.int.options as an example).

Changed

• Schema.extend() now keeps old type order in case of conflicts(e.g. Schema.extend([ a, b, c ]).extend([ b, a, d ]) is now ordered asabcd instead ofcbad).

[4.0.0] - 2021-01-03

Changed

• Checkmigration guide to see details for all breaking changes.
• Breaking: "unsafe" tags!!js/function,!!js/regexp,!!js/undefined aremoved tojs-yaml-js-types package.
• Breaking: removedsafe* functions. Useload,loadAll,dumpinstead which are all now safe by default.
• yaml.DEFAULT_SAFE_SCHEMA andyaml.DEFAULT_FULL_SCHEMA are removed, useyaml.DEFAULT_SCHEMA instead.
• yaml.Schema.create(schema, tags) is removed, useschema.extend(tags) instead.
• !!binary now always mapped toUint8Array on load.
• Reduced nesting of/lib folder.
• Parse numbers according to YAML 1.2 instead of YAML 1.1 (01234 is now decimal,0o1234 is octal,1:23 is parsed as string instead of base60).
• dump() no longer quotes:,[,],(,) except when necessary,#470,#557.
• Line and column in exceptions are now formatted as(X:Y) instead ofat line X, column Y (also present in compact format),#332.
• Code snippet created in exceptions now contains multiple lines with line numbers.
• dump() now serializesundefined asnull in collections and removes keys withundefined in mappings,#571.
• dump() withskipInvalid=true now serializes invalid items in collections as null.
• Custom tags starting with! are now dumped as!tag instead of!<!tag>,#576.
• Custom tags starting withtag:yaml.org,2002: are now shorthanded using!!,#258.

Added

• Added.mjs (es modules) support.
• AddedquotingType andforceQuotes options for dumper to configurestring literal style,#290,#529.
• Addedstyles: { '!!null': 'empty' } option for dumper(serializes{ foo: null } as "foo:"),#570.

... (truncated)

• 9963d36 3.14.2 released
• 10d3c8e dist rebuild
• 5278870 fix prototype pollution in merge (<<) (#731)
• See full diff incompare view

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